Question

The number of moles of $KMn{O}_4$ that will be needed to react completely with one mole of ferrous oxalate in acidic medium is:

• A. $\frac{2}{5}$
• B. $\frac{3}{5}$
• C. $\frac{4}{5}$
• D. $1$

Answer 1

Answer: (B)

$\frac{3}{5}$

The balanced chemical reaction is as shown below:

$3Mn{O}_4^{-}+5Fe{C}_2{O}_4+24H^{+}\to 3M{n}^{2+}+5F{e}^{3+}+10C{O}_2+12H_{2}O$

$3$ moles of $KMn{O}_4$ react with $5$ moles of $Fe{C}_2{O}_4$.

Hence, the number of moles of $KMn{O}_4$ that will be needed to react completely with one mole of ferrous oxalate in acidic medium is $\frac{3}{5}$.

Hence, the correct option is $B$